Epidemics are controlled by controlling the source of infection, cutting off the means of transmission, protecting susceptible people, and isolation. 1. Control the source of infection: mainly control the source of the epidemic. Comprehensive management can be carried out through early detection and early reporting through the epidemic surveillance system; for contacts, close observation can be carried out, and they should be isolated at home or reported to the local CDC, etc. to receive centralized isolation for medical observation. When isolated at home, suspected patients should live in separate rooms with good ventilation. 2. Cut off the transmission route: cutting off the transmission route is an effective measure to prevent the continued spread of infectious diseases. Since the transmission routes of various infectious diseases are different, the measures taken to cut off the transmission routes are also different. 3. Protecting susceptible people: People with low immunity should improve their immunity through better nutrition and exercise, but the most important way to prevent and control infectious diseases is vaccination. Pathogens can be transmitted through droplet transmission, direct transmission and fecal transmission. So be sure to protect yourself from infection.